If you are wondering how you can upload a certificate to IAM or where to go in the console in order to see or upload SSL Certs the answer is that this is done via the command line.
Here is a link to the process on how to do this: https://aws.amazon.com/premiumsupport/knowledge-center/import-ssl-certificate-to-iam/
You can also do it in the console under EC2,
on the left under Key pairs.
Then top right Actions / Import Key pairs.